Case Study

Hematoma visualized with SEMAR

“ Through SEMAR, Toshiba Medical offers us very effective metal artefact suppression, which enables the implant, as well as the surrounding tissue to be better visualized. Pathology in the direct vicinity of metallic implants can now be observed, which was previously impossible.”

Professor Dr. Hans-Bjorn GehlHead of the Institute for Diagnostic Radiology

Bielefeld Hospital, Germany

Patient HistoryA 73-year-old man presented with ongoing pain in the right groin following a hip replacement 3 months ago. The patient was referred for CT after other imaging tests, including conventional X-ray and ultrasound, could not determine the cause of the pain.

A post operative hematoma collection was seen in the right groin (arrow) confirmed with the SEMAR reconstruction images. Other nearby structures such as the prostate are better visualized on the SEMARTM reconstruction.

Results

Original SEMAR

http://www.toshibamedicalsystems.com©Toshiba Medical Systems Corporation 2017. All rights reserved.Design and speci�cations subject to change without notice.Model number: TSX-036A MCACT0313EA 2017-07 TMSC/Produced in Japan

Toshiba Medical Systems Corporation meets internationally recognized standards for Quality Management System ISO 9001, ISO 13485.Toshiba Medical Systems Corporation Nasu Operations meets the Environmental Management System standard ISO 14001.

Aquilion Lightning, SEMAR, SUREExposure and Made for Life are trademarks of Toshiba Medical Systems Corporation.

Computed Tomography

TechnologyToshiba Medical’s innovative Single Energy Metal Artifact Reduction algorithm (SEMAR) utilizes a sophisticated reconstruction technique to remove artifacts caused by metal and improves visualization of the implant, supporting bone, and adjacent soft tissues for clearer and more confident diagnosis. As metallic implants should no-longer be a barrier to routine diagnosis, SEMAR is included as a standard feature on all Aquilion CT scanners.

ConclusionSEMAR reconstruction is able to reduce metal artifacts to reveal pathology not visible with conventional CT reconstruction.

Acquisition

Scanner Model: Aquilion LightningTM

Scan Mode: HelicalCollimation: 0.5 mm x 80 Exposure: 120 kV, SUREExposureTM Rotation time: 0.5 second Dose Reduction: AIDR*1 3D EnhancedCTDI: 11.4 mGyDLP: 534.1 mGy∙cmEffective Dose: 8.01 mSvk-factor: 0.015*2

*1 Adaptive Iterative Dose Reduction*2 American Association of Physicists in Medicine (AAPM) Report 96, 2008.

Original Raw Data

Corrected Raw Data

Back Projection

AIDR 3D Reconstruction

Metal Extraction

Metal Component

Forward Projection

SEMAR Image

SEMAR algorithm

The SEMAR reconstruction extracts the metallic object from the raw data, performs an iterative reconstruction, eliminating the artifacts, and then adds the metallic object back into the final image.